<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>break案例</title>
</head>

<body>

    <p>点击按钮，测试带有 break 语句的循环。</p>
    <button onclick="myFunction()">点击这里</button>
    <p id="demo"></p>
    <script>
        function myFunction() {
            var x = "",
                i = 0;
            for (i = 0; i < 10; i++) {
                if (i == 3) {
                    break;
                }
                x = x + "该数字为 " + i + "<br>";
            }
            document.getElementById("demo").innerHTML = x;
        }
    </script>

</body>

</html>